Im not provided with tools to change my DA.
We supply (aircraft specific) crews with the option to use a different thrust rating, hence achieve a greater climb gradient, hence lower the DA.... see Hong Kong.
We also dispatch aircraft based on their ability to achieve the missed approach climb gradient that we have chosen, not 2.5%. This does lead to payload issues, however its must cheaper than hitting the terrain.
Crews are expected to calculate their landing distance/weight inflight based on the ATIS, and they are not permitted to use the Actual Landing distance once inflight (only in Emergency), they must use the Planned Landing distance.
The FAA have wimped out on a lot of things by issuing AC's rather than FAR's, my personal favorite is Contaminated Runways.
Mutt